Fuel delivery system

A fuel delivery system for delivering fuel from a fuel tank to an internal combustion engine, with said system comprising:

• a fuel pump disposed within the fuel tank for supplying fuel to said system;
• an accumulator communicating with said fuel pump and the engine for storing a volume of fuel under pressure;
• and,
• a flow control spool valve communicating between said accumulator and said fuel pump for controlling the output of fuel flow from said fuel pump, with said valve being responsive to the pressure in said system such that when the pressure in said system is increasing and is between a first predetermined threshold and a second predetermined threshold, said valve causes said fuel pump to supply fuel to both the engine and said accumulator and when the pressure in the system is above said second predetermined threshold, said valve causes said accumulator alone to supply fuel to the engine, with said valve defining a hysteresis such that, when the pressure in said system is decreasing and is between said second predetermined threshold and said first predetermined threshold, said valve causes said accumulator to continue to supply fuel to the engine and when the pressure in the system is below said first predetermined threshold, said valve causes said fuel pump to immediately supply fuel to both the engine and said accumulator.

A fuel delivery system for delivering fuel from a fuel tank to an internal combustion engine, with said system comprising:

• a fuel pump disposed within the fuel tank for supplying fuel to said system;
• an accumulator communicating with said fuel pump and the engine for storing a volume of fuel under pressure;
• and,
• a fuel pump control means for controlling the output of fuel flow from said fuel pump, with said fuel pump control means being responsive to the amount of fuel volume in said accumulator such that when the volume in said accumulator is increasing and is between a first predetermined threshold and a second predetermined threshold, said fuel pump control means causes said fuel pump to supply fuel to both the engine and said accumulator and when the volume in said accumulator is above said second predetermined threshold, said fuel pump control means causes said accumulator alone to supply fuel to the engine, with said fuel pump control means defining a hysteresis such that, when the volume in said accumulator is decreasing and is between said second predetermined threshold and said first predetermined threshold, said fuel pump control means causes said accumulator to continue to supply fuel to the engine and when the volume in said accumulator is below said first predetermined threshold, said fuel pump control means causes said fuel pump to immediately supply fuel to both the engine and said accumulator.